@article{GDZPPN002409313, title = {A Generalization of Bohman-Korovkin's Theorem.}, journal = {Mathematische Zeitschrift}, volume = {121}, year = {1971}, pages = {63-70}, zbl = {0203.13004}, url = {http://dml.mathdoc.fr/item/GDZPPN002409313} }
Schempp, Walter; Felbecker, Günter. A Generalization of Bohman-Korovkin's Theorem.. Mathematische Zeitschrift, Tome 121 (1971) pp. 63-70. http://gdmltest.u-ga.fr/item/GDZPPN002409313/